@INCOLLECTION inherits the titleaddon of @BOOK

I am quoting some text out of collections. These collections are
»herausgegeben und eingeleitet von G. Patzig« /Edition and introductory
note by Patzig/. I added this information within a titleaddon of the
@BOOK entry.

Unfortunately the single texts of the collection inherit this titleaddon:

\begin{filecontents}{test012.bib}
@BOOK{FregeFBB,
  author =     {Gottlob Frege},
  title =     {Funktion, Begriff, Bedeutung. Fünf logische Studien},
  titleaddon =      {Herausgegeben und eingeleitet von Günther Patzig},
  shorttitle =     {Funktion, Begriff, Bedeutung},
  publisher =     {Vandenhoeck {\&} Ruprecht},
  address =     {G"ottingen},
  edition =      {7},
  year =     1994,
}

@INCOLLECTION{FregeFuB,
  author =     {Gottlob Frege},
  title =     {Funktion und Begriff},
  shorttitle =     {Funktion und Begriff},
  pages =     {18--39},
  crossref =     {FregeFBB},
}
\end{filecontents}
\documentclass[ngerman]{book}
\usepackage{babel,jurabib}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\begin{document}
Frege schreibt in FuB\footcite{FregeFuB} und Patzig kommentiert in
FBB\footcite{FregeFBB}.
\bibliography{test012}
\bibliographystyle{jurabib}
\end{document}

PS: Sorry for those who allready read this on d.c.t.t. and couldn't help.



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